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Papers by Chanpreet Singh

Materials Today: Proceedings, 2021

International Journal of Advances in Computing and Information Technology, 2012

Effect of Reynolds number and Nusselt number in fluid flow for laminar air flow condition is inve... more Effect of Reynolds number and Nusselt number in fluid flow for laminar air flow condition is investigated by experimentally and numerically for two types of plates: (1) Flat plate (2) Copper plate. Circular holes were placed on both sides of a copper plate with relative pitch of S/D=1.21 and relative depth of δ/D=0.2. The average heat transfer coefficient and Nusselt number ratio were determined experimentally. For circular holes heat transfer enhancements were observed for Reynolds number range from 500 to 1700. Moreover, pressure drop, thermal performance and flow characteristics were numerically simulated. According to both types of investigation the heat transfer coefficients of the numerical results were very close to the experimental result. Circular holes enhanced heat transfer from its surface for laminar air flows while the pressure drop was equivalent or smaller than that of the flat surface. These surfaces do indeed enhance thermal performance without the penalty associated with higher pressure drops. Finally good agreements are found between the numerical predictions of this study and other experimental data.

The Flow through saturated-unsaturated porous media is extremely important in various natural and... more The Flow through saturated-unsaturated porous media is extremely important in various natural and industrial based applications. While the Darcy’s law with various modifications are used to model the flow through a porous media, the flow through unsaturated porous media is largely based on conservation of mass and modified Darcy’s law where non-linear relationship exists between the pressure head and the fluid saturation coupled with fluid density variations. This paper represents mathematical modelling of flow through unsaturated porous media using constant and variable fluid density. The variable density model is further split into thermal and Isothermal models. The mathematical model is applied to an unsaturated porous media filled with water and oil having immiscible flow. The variables describing the models like permeability, capillary pressure, fluid saturation and their constituent relations are considered. The models are extremely important for different industrial applicati...

The present study reports the heat transfer enhancement in a heat exchanger tube by installing se... more The present study reports the heat transfer enhancement in a heat exchanger tube by installing seven different baffle arrangements. The purpose of the study is to find out the optimum baffle shape and arrangement. For this analysis, a three dimensional finite volume based CFD tool ANSYS 14.5 Fluent was used. A heat exchanger tube of length 0.1m and tube diameter 0.01m which was made of Al and Cu has been considered. All the calculations were carried out at 10,000 Reynolds number. Boundary conditions were defining with appropriate material property in fluent software. In the solver, all flows were specified as steady state and incompressible. The realizable k-e turbulence model with standard wall function was set for all models for turbulent flow. According to results, it concluded that in case of single baffle used, rate of heat transfer is maximum for rectangular shape baffle surface and in case of baffle combinations; rate of heat transfer is maximum for rectangular and triangular...

This paper deals with the effect of oscillatory flow on front amplitude, front speed, front sprea... more This paper deals with the effect of oscillatory flow on front amplitude, front speed, front spread in porous media for different solid medium of same particle size at different Reynolds number. The solid material of 6.5mm is used as spherical balls of steel and glass material. Normal water is used as a fluid. The size of porous bed is less than the 1/10 of diameter of the tube. The steel spherical balls of diameter 6.5 mm constitute a porous bed which will act as Steel Water Bed and glass spherical balls of diameter 6.5 mm constitute a porous bed which will act as Glass Water Bed. The front amplitude of steel water bed was found to be decreasing with distance and value was low as compared to glass water bed. The value for front speed of Steel water bed was higher in comparison to the glass water bed. Front spread is observed for hot phase. The value for front spread of steel water bed was higher in compression to the glass water bed.

Journal of The Institution of Engineers (India): Series C, 2020

The effect on natural convection in a condenser tank containing Al 2 O 3-DI water nanofluids is s... more The effect on natural convection in a condenser tank containing Al 2 O 3-DI water nanofluids is studied. The tank is located on one end of a copper pipe whose other end is heated electrically. The nanofluids are prepared by twostep method by dispersing non-metallic oxide Al 2 O 3 particles of 32 nm in DI water at volume fractions of 0.05, 0.1 and 0.15%. The analytical and experimentally obtained thermo-physical properties of the nanofluids are within the acceptable limits. Unsteady temperature profiles in the pipe and the condenser tank are plotted. The use of nanofluids in the condenser enhances the conduction heat transfer in the pipe and the convection in the fluid. The thermal resistance of the pipe with nanofluids in the condenser tank is lower than DI water. A higher Nusselt number is obtained for the nanofluids and the corresponding Rayleigh number is lower. Keywords Natural convection Á Al 2 O 3-DI Water nanofluids Á Condenser tank Nomenclature A Cross-sectional area (mm 2) c p Specific heat (J kg K-1

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2015

Natural convection heat transfer from a hot vertical hollow brass cylinder has been studied exper... more Natural convection heat transfer from a hot vertical hollow brass cylinder has been studied experimentally and numerically. The governing equations of continuity, momentum and energy are discretised by using an implicit finite difference technique. The velocity and temperature profiles, boundary layer thickness, local and average heat transfer coefficient are obtained using the numerical simulation. The predictions of the numerical simulation are compared with the experiments conducted on a laboratory-scale apparatus and with the results obtained from analytical solutions available in literature. The numerical simulation results are obtained for two fluids; air and water vapour whereas the experiments are conducted for air only. The induced flow is laminar in both the simulation and the experiments. The dependence of boundary layer thickness on Prandtl number is discussed. The numerically obtained Nusselt number is found quite close to the analytical one. The results show the heat d...

Advances in Intelligent Systems and Computing, 2017

In present study, fuzzy logic is used to predict the free convection over a heated vertical cylin... more In present study, fuzzy logic is used to predict the free convection over a heated vertical cylindrical tube. Tube has diameter 38 mm and length 500 mm. Numerical simulation involves use of implicit finite difference scheme to solve the fluidics equations for vertical tube. Tube is imposed to a fine structural grid and appropriate boundary conditions. Properties of two fluids namely air and water vapour is used for numerical simulation. Grashof number is varied from 2.04 × 106 to 2.62 × 108 and 2.69 × 106 to 3.36 × 108 for air and water vapour respectively. A computer code in FORTRAN programming language is used to draw velocity and temperature profiles. Fuzzy Interface System Mamdani is used to evaluate output membership from different fuzzy sets. Fuzzy predicted results are found in good agreement with experiments. Rayleigh number was found 1.45 × 107 to 3.63 × 108 and 2.66 × 107 to 6.67 × 108 for air and water vapour. Fuzzy logic results confirm ±4% agreement with experimental results.

Journal of Electronics Cooling and Thermal Control, 2012

In vortex motion fluid moves in curve path and the stream lines are curved. When the fluid flows ... more In vortex motion fluid moves in curve path and the stream lines are curved. When the fluid flows between curved stream line, the centrifugal forces are setup which is counter balanced by pressure forces acting in the radial direction. The vortex motion has two types of curved motion. The first type called free vortex type, the fluid moves due to its own natural effect but energy is not added to fluid when moving in curved path. The second type called forced vortex, in which energy is added to fluid. A two dimensional steady laminar free convective flow of viscous incompressible flow in porous media voids is considered. In this paper the motion of fluid is studied while moving in the porous media. It is studied that the motion of the fluid in the porous media is vortex motion at the low Reynolds's number, where the motion is laminar motion and the fluid obeys the laws of vortex motion.

2014 International Conference on Medical Imaging, m-Health and Emerging Communication Systems (MedCom), 2014

Telemedicine in India has achieved success and is seen as a parallel healthcare delivery system. ... more Telemedicine in India has achieved success and is seen as a parallel healthcare delivery system. Therefore, a need arises to extend its benefits to the rural and inaccessible populace. This paper highlights the telemedicine network established by CDAC, Mohali for an eHealth camp, a unique makeshift camp was organized based on public-private partnership, to extend healthcare services in Ajmer, Rajasthan. A total of 442(n=442) patients were treated during the camp and tele-consultations were conducted with the team of medical experts residing at PGIMER Chandigarh. This paper evaluates the responses of the patients attending the camp on the parameters: user satisfaction and user acceptability. The outcome of the responses from the patients portray a healthy acceptance towards eHealth camps using telemedicine technology in the rural areas, and expressed that lack of `human-touch' by healthcare professionals in an makeshift arrangement was not necessary in healthcare treatment.

Miniaturization has been a trend in modern science and technology and this trend is rapidly emerg... more Miniaturization has been a trend in modern science and technology and this trend is rapidly emerging as a new revolution in the form of nanotechnology. As a new and dynamic research frontier, nanofluids are used to enhance thermal conductivity of the base fluids. Nanofluids of metallic solids in pure state(Silver, gold, copper etc.), non metallic solids, metallic liquids (Al, Na at 644K) and carbon nanotubes in particular have been a major focus of various scientists all over the world for their valuable thermophysical properties. This paper presents a brief report on synthesis of silver and gold nanofluids by chemical reduction method and studies of thermophysical properties of the silver nanofluids i.e. thermal conductivity in particular. The synthetic route opted here is advantageous as it is an in situ preparation as well as economic in terms of time and cost. The varied and important potential applications of silver and gold nanofluids are alsoInternational Journal of Enterpris...

Heat and Mass Transfer, 2006